Telephone signaling system.



F. R. PARKER.

TELEPHONE SIGNALING SYSTEM.

APPLIOATION FILED AUG. 24, 1904.

1,103,909. Patented July 14,191;

INVENTORZ UNITED ST T PATENT orruon.

FREDERICK R. PARKER, OF CHICAGO, ILLINOIS.

TELEPHGNE SIGNALING SYSTEM.

Specification of Letters Patent. Patented Jun 14:, 1914.

Application filed August 24,51994. Serial No. 221,984..

To all whom itmay'conoern Be it known that I, FREDERICK R. PAR- xnx; a citizen of the United States of America, residing at Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Telephone Signaling System, of which the following is a specification, reference beinghad to the accompanysystems; to provide improved apparatus to be used in such systems for various pur-.

poses and in connection with such signals for operating or manipulating same; to provide improved circuit arrangements in such systems; to provide a suitable highly-efiicient electric signal lamp adapted to be op- ,erated or manipulated in series with both long and short telephone lines, and im proved line-signaling systems embodying such lamps. 7

Other objects will be appare nt from the following specification.

In this present invention I have shown the telephone line circuit described and claimed in my application for United States Letters Patent on'telephone system, filed June20, 1904, Serial'No. 213,284, but do'not wish to be limited in this invention to this particular line circuit. In connection with this line objects of this'invention to thus connect the.

circuit I have shown my special signal lamp,

The double armature relay illustrated in this present invention forms the subject matter'of my co-pending application for United States patent on electromagnet. filed February 19, 1904, Serial No. 194,392.

I have shown the central source of elec tricity and the special signal lamp connected in series with the telephone line, and I desire it to be understood that it is one of the said signal lamp. If the said lamp is of a voltage approximately the same as the battery voltage, other apparatus, such as impedance coils, resistance coils, relays, etc, may be excluded from this signaling circuit at the central station. The operation of the line cutoff relay in the line circuit shown,

disconnects the signal lamp and central source of electricity from the telephone line.

I have also shown a modified form of line i circuit in which any one of a number of fjaCKS s adapted to disconnect the line sig nalmg device and cent'ralsource of current from the telephone line when a connecting plug is inserted therein.

The special line signal lamp which I em ploy. is designed to be lighted to candle.

power on a very small current, and preferably on a rather highvoltage. With such a lamp (and the consequent relatiye highrresistance thereof in relation to its voltage) a variation in the line resistance, which is in series with the lamp, from zeroto a maximum, say to several hundred ohms, will not be sufficient to materially change the small current through'the lamp, and will therefore not materially affect the luminosity thereof.

Heretofore it has not been practical to light a signal lamp inseries with a reasonably long telephone line, for the reason that signal lamps heretofore required such ,a large current, and were consequently of such low resistance in relation to their voltage, I

that with a higlrresistance line the lamp would not receive sufficient current to cause it to light, or else if the lamp did receive suflis cient current over a long line, on a short-circoil: of the line near the central station the lamp would burn out; the variation in the current, caused by such a variation in the line resistance, being too great for the lamp.

With such a lamp and sufficient resistance in series therewith, at the central station to protect the lamp from burning out on a short-circuit of the line at the central station, the voltage requiredto give suiilcient current tolight the lamp over the long line would be so'high as to be prohibitive in telephone systems.

In this present invention I empldy a lamp which E have perfected to be lighted in series with both long and shortlines on a reasonable voltage wrthout requiring any resistancein the circuit for regulating the flow of current (prrwid'ed the voltage of the lamp is approximately that of the battery), and

have found that lamps taking from .05 of an ampere to .04 of an ampere, and having a resistance of from 750 ohms to 1200 ohms, depending on the voltage used, give very satisfactory results. I use a lamp taking this small current, and of the consequent relative higlrresistance, so as to enable me to ice signal over long lines, and at the same time protect the lamp from burning out on a short-circuit of the line at the central station, as with a reasonably high voltage, say 52 volts, the variation of the line resistance from zero to several hundred ohms, is small compared with the resistance of the lamp for this voltage, and therefore does not'reduce the current through the lampsufiiciently to extinguish its signal. The 1200 .ohm lamp gives a good signal with more than 1000 ohms resistance in the line circuit, and will not burn out \vhen'the line isishorhcircuited at the central station. The reason for this is, that the resistance of a long line is such a, small roportion of the total resistance of the circuit that the voltage on the lamp is not decreased to any great extent by the introduction of this long line resistance into the circuit. The lamp used in my present invention is a distinct improvement over an electromagnet, both in simplicity and cheapness, and it gives good signals through variations of line resistance through which electromagnets are required tooperate. It is obvious that lamps taking a still smaller current will also give good results, and such lamps are contemplated in this invention. I also Wish it to be understood that lamps taking a small current and also a small voltage, may be used in series with a resistance, where the battery voltage used is considerably higher than the lamp voltage. In such an arrangement it is clear that the small current (which is a feature of this invention) is still maintained. In short, any lamp takinga small amount of current, may be used with success in circuit with either long or short lines.

In the connecting circuit I employ a double-armature relay or electrically-operable device for operating or controlling a supervisory or disconnect signal. The armatures of this relay device may be operated sepa rately for controlling the signal, preferably on dili'crent strengths of magnetism in the relay, one armature preferably closing a contact in the supervisory signal circuit and the'otlarmature preferably opening a contact n the same circuit. I preferably close and open the same contact in the supervisory signal circuit, with the respective armotures, out it obvious that separate contacts may be used witlrthe same result. nmiures of t relay may control lilo :ro Ans oi circuits as de- 'Ihoilimwzi battery herein shown, provides siri ans for sending a large or small current through the supervisory relay to produce different fititllgtllr of magnetism herein, as will be hereinafter described, but

do not wish to'be limited t this arr device, As will be r current that operates one of the armatures of the supervisory relay, in the system illustrated, traverses the Winding of the relay in the direction opposite to which. the current which operates the other armature traverses the said Winding. This reversal of current through, the. supervisory relay enables me to use. a double-acting armature thereon, if desired, as set forth in my above mentioned application for Letters Patent on telephonesystem, Serial No: 21328 1.

I have preferably shown the talking battery to be a part of the signaling-in battery, but it is to be understood that the talking source of electricity may be entirely separate from the signaling source. v

I will now more particularly describe my invention by reference to the accompanying drawings illustrating the preferred form thereof, in'which, I

Figure 1 is .a diagram showing two subscribers lines and the central station signaling and connecting apparatus; and Fig.

'2 is a diagram showing the line-signal lamp and the central source of current adapted to be cut from the talking telephone line by a conn'ecting 'plugz instead of by a cut-off relay, at any oneof a number of spring jacks.-

Like characters refer to like several figures.

The line of subscriber A extends in tWo limbs a and b from a substation to a central parts in the station Where the said limbs pass through the respective windings c and (Z of relay F and terminate in the respective connection terminals m and 'n, (or m and n of'the several, spring jacks C C of a multiple switchboard. Spring members 9 and f of relay F are permanently connected to the limbs a and Z), respectively, of the line, and normally engage the respective contacts i and h. Contact 2' is connected through conductor 3 to pole t of battery E, and contact h is conncctedthrough conductor 7;, line-signal lamp Land conductor 9'', :to pole u of hatteryl). Batteries E and D are connected in series and it is immaterial which is the positive or negative end pole-oi battery E I). When armature 7c of relay F is attracted to the cores thereof, springs g and f are disengaged from contacts iand t, respectively. in case of a groi'mded-return or-commoiw' iurn line, theground or common condo-Muir constitutes one limb of the telephone line.

t the. subtcrihefs station I have shown one cf :1 number of circuit ax. n -nts in which the operation of the so one either the talking appara :1gnaling app; use over the line, in a veil understood that it need not here.

f subscriber B, shown upon the in; drawing, is similar to line A,

h-hook eonand like characters have been employed to indicate like parts.

In the plug-cord bonnecting circuit the main strands of the connecting cords N and O are connected together through-the respective condensers c and d listening key" L and ringing key M. Tip strand a, of answering plug N is connected through impedance coil G to pole tof battery E. Tip strand 8, of calling plug 0 is normally connected through spring i contact 70 spring f contact 9 and impedance coii H, to pole t of battery E. Sleeve strand of answering plug N is connected through conductor 10 winding-y of supervisory relay I, and conductorm, to the middle pole c of battery E D. Sleeve strand t of calling plug 0 is normally connected through spring 9 contact 0,, contact Z spring m conductor 0 winding .2 of supervisory relay K, and conductor w, to the middle pole o of battery E Supervisory lamp 8,, is connected from conductor m to sprin m of relay 1, and spring 20 of this relay is'connected through condu'ctors w and a to pole at of battery I). .Thus it will be seen that-signaling devices,;is connected in a closed circuit across battery :D' when-'the-contact is made between springs m, andxw Supervisory lamp 25 is connected from conductor :0 to spring as, of relay K',"-and contact a of this relay is normally connected through contact 11- spring Q0 and conductors w and r to pole u of battery D. Thus it will be seen that signaling device 6, is connected in a closed circuit across battery D when the contact is made between spring a, and contact 14 Armature 2 of relay 1, when attracted to the a e of 1, moves spring 95 into contactv with spring 10 and armature y, of this welay, when attracted to the core thereof, moves spring 20 out of contact with spring m if armature .2 was previously attracted, or, it armature 2 was not previously attracted, armature 3 simply maintains an open contact between springs w, and :0 Armature 2 is adapted to pull up ?,\with asniall currentin winding 3 of the relay, and armature 3 with larger current in the said Winding. I have preferably shown armature 2 as being interposed between armature g and the core of the relay, but other ar rangenients of the armatures may be used with good results.

A special feature of this invention is to operate and control a supervisory signal by a role y device naving two arniatures adapted to pull up on different strengths of magnetism in the relay device, or different energizations thereof, whatever may be the a rrangemeut of the armatures.

Armature of relay K, when attracted "to-the core of the relay, operates spring in,

and thereby brings it into contact With i spring 12,. Armature i 3 of relay K, when attracted to the ccre the relay, operates spring w andfther-e v o thencrnially closed contact between springs (w, andu Arni'at'ure 2 is adapted to pull up "-with a small current in winding 2 of relay K, and armature Q 3 with alarger current in the said winding. matures of relay K open and close respective contacts in its supervisory signal circuit, while the armatures of relay Iboth open and close the same contact in its super visory signal circuit. This simply illustrates two ways of accomplishing the same result.

r-w A .L 9,, pg L; 2 b 4 inc vpCIfibOl s telephone 5Gb is to e con nected from contact a, to contact 0, of the listening key L, in a manner well understood but not shown in the drawings; When the' listening key-L is depressed, springs f and m aredisengaged from contactsg' and- Z respectively,1 and engaged with contacts 'e Tand -o gj respectively;

'Av-euit abie ringing generator is to be connectedto contactsh, and?" of ringing key M, in a-inanner well understood. I When the 'ringing key M is depressed, springs 91, and

92 are disengaged from contacts is, and 29,, respectively, and engaged with contacts 71., and 1 respectively.

The operation of the system 'is as follows :If subscriber A desires to talk, with subscriber B, be lifts his telephone receiver from the switch-hook and thereby closes the It willbe seen that the ar circuit of battery E D through conductor .9, contact 2', spring g, limb a of the tele phone line, sub-station A, limb b of the line, spring 5*", contact h, conductor p, lamp Z, and conductor a, thus allowing current from battery E D to fiow through lamp Z andlight same, and thereby convey to the operator the signal for connection. The opierator thereupon lifts answering plug N and inserts same into a spring jack C of line A, which closes the -circuit of battery E through impedance coil G, tip strand (4,, jack spring m, winding e of cut-oil relay F, limb a of the telephone line, substation A, limb?) of the line, winding (2 of relay F, jack spring n sleeve strand 6,, conductor n winding y of supervisory relay I, and conductorw, thereby-energizing relay F and 'causingits' armature In to be attracted and thus disengagesprings' f and g from con-- tacts h and 11, respectively, and also energizingrelay I with sufficient current to attract armature y, thereof and thus maintain an open contact in-the circuit of supervisory signal 8 Then armature k of relay F is attracted, it cuts the central source of'current and the line signal lamp Z from the talking telephone line, thus opening the circuit of its signal at contact '71 and thereby extinguishing lamp Z. It is inmmterial whether armature 2 of relay I is new attracted or not, as-itcannot close the contact between springs as, and Q0 while armature 3/2 is attracted, but I have preferably shown a relay in which armature 2 is at this time attracted with armature 3 by the current- C of line B. She'then depresses t e ringing key M,.in the usual manner, and at the same time restores thev listening key L to its normal position. In depressing the ringing key M, the operator closes the circuit of the ringing generator (not shown) through'contact h spring 2' tip strand s jack spring m of line B, winding 0 of relay F, limb a of the telephone line, substation B including a ringer, limb b of the line, winding (5 of re-.

lay F, jack spring n, sleeve strand t spring 9 and contact 1' thus ringing the said ringer which signals subscriber B. After subscriber B is signaled the ringing key M returns to its normal position. Relay'F is constructed to respond, to the said ringing current and thereby disengage springs g and 7 from contacts 2 and h, respe'ctively, during the sending of the said ringing current over. the line of subscriber B, which disconnects the central sourceof current and the line signaling apparatus from the telephone line'. When the ,ringin key is restored to its normal position, re ay F of line B is deenergized and springs g and f again engage contacts 2', and h, respectively. Before subscriber B responds to his, call, the circuit of the central source of current E D is not closed over his tele hone line, but the circuit of battery 1) is-c' osed'through conductor w, winding 2 of supervisoryrelay K, conductor v spring m contact Z contact 7),, spring '9 sleeve strand t jack spring 92 of line B, winding d of relay F, spring f, contact 72., conductor 'p, line signal lamp Z, and conductor 1-, which does not allow suflicient current to flow through relay F to ac tuate its armature, nor sufficient current to flow through lamp Z to light same, but which .does allow sufiicient current to flow through supervisory'relay'K to actuate armature- 2 only, thereof, and thereby close the contact between springs m and v thus closing the circuit-of battery D through the supervisory signalingde'vi'ce 25 and causing same to'display a'signa l. Whenv subscriber B answers his call, he closes the circuit of battery E through impedance coil H, contact g' ,'spring f contactspring z' tip strand s jack spring m of line B, winding 6 of relay F, limb a of the telephone line, substation B,

limb b. of the line, winding (1 of relay F, jack spring a, sleeve strand t spring g contact 39,, contact Z spring m conductor 4: winding 2 of relay K, and conductorw,

which energizes relay F and causes its armature to be attracted and thereby disengage springs g and f from contacts 71 and it, re-

spectively, and which also energizes relay K and causes armature 11 thereof'to be attracted and thereby disengage spring w,

from contact 11 thus breaking the circuit through lamp t and extinguishing its signal. Armature a of relay K, may or may .not be attracted, itbeing unable to afi'ect the lamp t when armature y is attracted. The line lamp Z of line B is now inoperative as the circuit through same is broken at contact h.

' Subscribers A and B are now connected for;

conversation with each other, all of the signals being inactive. When the conversation is completed. and subscriber A hangs his telephone receiver upon its switch-hook,"he

breaks the circuit of battery E over his line, in a manner wellunderstood, which stops the how of current through relays F and land allows their armatures to release. W'lfn armature k of relayF releases, it causes spring f to engage contact h and thereby close the circuit ofbattery D through conductor 0:,

winding y of supervisory relay I, conductor a sleeve strand b jack spring 91. of line A, winding (1 of relay F, spring f, contact h, conductor 79, lamp Z, and conductor 7'. The current from battery D now flowing through relay I is suflicient to cause armature 2 thereof to be attracted and thereby close the contact between springs :0 and w but this current is not suflicient to cause armature 3 tobe attracted. Armature e therefore closes the circuit of battery D through conductor as, supervisory lamp 1: spring m spring 202, and conductors to and 1', and thereby causes lamp 5- to light and convey to the operator the signal for disconnection. The current now flowing through relay F is not sufficient to attract armature 76 thereof, nor sufficient to cause lamp l to light. It is obvious that if subscriber A should again take his telephone receiver from the switch-hookv while connection is still made with his line, he

would cause the supervisory lamp 3 to be extinguished. By thus operating the switchhook, the subscriber -A may signal the operator for a second connection, through the agency'of the supervisory signal. It will be noted. that the current whichattracts armature 2 only, of relay 1, traverses the;

windin y thereof in the direction opposite to whic the current which attracts armature y, traverses the same winding. This re versal of current enables me to use opposite magnetic forces to operate the respective armatures of a supervisoryrelay device,-if de-.

sired, or to operate other forms of electrically-operabledevices.

lllhen subscriber B hangs his telephone receiver upon the switch-hook, he causes his supervisory lamp 2, to convey to the operator :1 signal tordisconnection, just described in connection with subscriber A, only that subscriber B causes armature 2 of relay K to close the contact between springs a and in the supervisory signal circuit, whereas subscriber, A caused armature 2 ofrelay I to close the contact between springs as, and 21: It is obvious that if subscriber B should again raise his switchhook while connection is still made with his line, he would cause his supervisory signal if, to be extinguished. When the operator receives both disconnect signals from subscribers A and B, respectively, she withdraws the connecting plugs N and 0 from their respective spring jacks, thus breaking the battery circuits through supervisory relays I and II and allowing their armatures to release, thereby restoring both telephone lines and all central station circuits and apparatus to their normal condition.

- d line-signal lamp 1,, battery E I),

It is obvious that subscriber B may be the calling subscriber, and subscriber A the called subscriber, but it is not thought to be nccc ry to give a detailed description of the diiierent operations performed in thus connecting the system, as itwould be practically the same as the above description wherein subscriber A is the calling subscriber and subscriber B is the called subscriber. With such connections, plug l? would be connected with line B and plug 0 would be connected with line A, the operations with lines A and B being interchanged.

In Fig. 2 I have shown a series of spring or'connection terminals J, J J tor a telephone line. eaclijack being adapted to disconnect the central station signaling apparatus and source of electricity from the telephone line when a connecting plug inserted thereii The-line circuit is. from limb 11 01 the telephone line, through spring 0, of jack J, conductor (Z spring of jack J conductor (Z spring c -of jack 1., conductor conductor contact f spring c, of ack .L. conductor 7' spring 0,, of jack J conductor f spring 6,, of jack J and limb 71 of the telephone line. lVlien a connecting plug is inserted into a my one of the several spring jacks of the line, springs 0 6,, or c, 0,, or c 6 etc., are caused to disengage their respective contact. members and thereby cut the signaling device Z and source of current E I) from the telephone line. The guide rings 0,, (1,, of the several jacks are connected together by conductor b, for a busy-test arrangement, in

a manner well understood.

is I have illustrated this invention in connection with particular types of spring connecting plugs. keys, line cut-ofi super isory relays and signals,

sources of electric current, and auxiliary apdifi'erent types of these several pieces of apparatus may be used.

I have shown and described this invention in connection with multiple switchboard systems, but it is apparent that its features are also applicable to systems of the single, transfer, and divided board types.

I do not wish to-limit this invention to the ..,particular details nor to the particular arrangement of parts herein. shown, as the principles involved may be carried out with numerous modifications thereof without departing from the scope of the appended "claims. I also wish it to be understood that certain parts of the invention may be used apart from other parts tl ,ereor".

Having thus described my hiventiomwhat I claim is-- 1. A. telephone line-signaling system comprising a telephone line having a signal lamp connected in series therewith,-the said lamp having a filament with a current=carrying capacity not exceeding approximately fiveonehundredths of an ampere, and means for lighting the lamp over the line to give a signal.

2. A telephone line-signaling system comprising a telephone line having a signal lamp connected in series therewith, the said lamp having a filament with a current-carrying capacity not exceeding approximately fiveonehundredths of an ampere whereby it may be lighted in series with a high-resistance line to give a'signal and also through a shortcircuit of the line resistance without burnover the line to give a signal.

3. Atelephone line-signaling system com prising a telephone line having a signal lamp connected in series therewith, the said lamp having a filament with a current-carrying capacity not exceeding approximately five onehundredths of an ampere whereby it may be lighted in series with a line having a resistance of at least five-hundred ohms to give a signal and also through a short-circuit of the line resistance without burning out, and means for lighting the lamp over the line to give a signal.

4. An electric lamp having a high-resistance filament constructed to carry a maximum current not greater than approximately ive-onehundredtiis of an ampere, a telephone line, and means for lighting the lamp in a series circuit with the line to display a signal. 1

5. In a telephone system, the combination with a telephoneline and connection terminals connected-thereto, of a line-signal lamp connected to the'said line, a cut-off relav associatedwith the-said line and adaptnnect the said line-signal lainp phone line when in an operated paratus, I desire it to be understood that.

ing out, and means for lighting the lamp condition, a plug-cord circuit adapted to be conductively connected with the said line, a supervisory signal-controlling relay connected to a talking strand of the said plug-cord circuit, the said supervisory relayv being equipped with two armatures, one armature being adapted to close a contact in the supervisory signal circuitand the other armature being adapted to open .a contact in the' same circuit, a source vof electricity asso-v ciated with the said supervisory relay and with ,the" said line-signal lamp, means for closing a circuit of the said source through the sald supervisory relay and thereby actuating one of its armatures, when connection is made with the line, thus closing a contact in the said supervisory signal circuit, the said supervisory relay circuit including a talking strand of the plug-cord circuit, .a

terminal of the connecting plug, a main line terminal, and the said line-signal lamp and means on the line for operating the other armature of the supervisory relay and thereby extinguishing the supervisory signal, substantially as described.

e6. Ina telephone system, the combinationwith a metallic telephone line and connection terminals connected to the respective limbs thereof, of aline-signal lamp connected to one limb of the said line, a central source of electricity connected to the other limb of the said line, a cut-oflt' relay associated with the said .line and adapted to disconnect the said line-signal lamp and source of electricity from the respective limbs of the telephone,- line when in an operatedcondi; tion, a plug-cord circuit adapted to @be con ductively connected with the respective limbs of the said line, the said source of electricity being associated with a talking strand of the plug-cord circuit, a supervisory, signal-controlling relay connected to a second talking strand of the said plug-cord circuit, the said relay'being equipped with two armatures, one annature being adapted to close a contact in the supervisory signal ing strand of the plug-cord circuit, a main terminal of the connecting plug, a mainline termina and the said line-signal lamp and means on the line for operating the other armature of the supervisory relay and thereby extinguishing the supervisory signal, substantially as described.

7. In a telephone system, the combinatien with a telephone'line and connection terminals connected thereto, of a line'signal associated with the said line, a plug-cord circuit adapted to be connected with the said line, a supervisory relay associated with the said plug-cord circuit, the said relay being provided with an armature adapted to close a contact between two'springsand also with a second armature adapted to" open the same contact between the said springs, a super- .visory-signal lamp connected to one of the said springs, a divided I source of electricity a portion of which is connected to thesaid supervisory-signal lamp and to the other saidspring, the said divided source of electricity being associated with the plug-cord circuit, with the supervisory relay and with the telephone line ,and line signal, means whereby, when the said plug-cord circuit is conductively connected to the said telephone line, the circuit of a portion of the said divided source of electricity is closed through the said supervisory relay, thus allowing aweak cur rent ,to flow through the said relay and actuate one armature thereof, the said armature closing the circuit through the supervisory signal lamp and its source of current and thereby lighting the said supervisory lamp, and means whereby, when the circuit of the telephone line is closed while connection 'is made therewith, the circuit of another per tion of the said divided source is closed through the said supervisory relay, thus allowing a stronger current to flow through the said relay and. actuate the said second armature thereoflthis said second armature opening the circuit through. the supervisoryal lampand thereby extinguishing same, su stantially as described.

8. The combination with of a plug-cord circuit adapted to be cona telephone line,

nected therewith. a double-armature relay associated with the plug-cord circuit, a supervisory signal circuit adapted tobecontrolled by the said armatures, one said arma ture being adapted to close a contact in; the said supervisory circuit, the other said armature being adapted to open a contact in the same supervisory circuit, and means for actuating the said armatures separately and thereby controlling the operation of the supervisory signal.

9. The combination witha telephone line, of a plug-cord circuit adapted to be conductively connected therewith, a double-armature supervisory relay associated with a strand of the plug-cord circuit, a super- -visory signal circuit undercontrol of the said relay, means for actuating one armature of the said relay when connectionis tnade with the telephone line and 'the ClI'Qillt of the telephone, line is open, and means for actuating the other armature of the "said relay when connection is made with the telephone'line and the circuit of the telephone .line is closed.

10. The combination with a telephone line, of a. plug-cord circuit adapted to be connectedwith the said line, a double-armature supervisory relay connected to a connecting strand of the plug-cord circuit, a supervisory signal circuit under control of the said. relay/a central source of electricity associated with the plug-cord circuit and with the telephone line, means for sending a weak current through the said relay when connection is made with the telephone line and the said line is netin use, and thereby actuating; one of the armatures ot the said relay, and means for sending a stronger current, through the said relay when connection is made with the telephone line and the said line is in use, and thereby actuating the other armature of the said relay.

11. in a telephone system, the combination with a calling telephone line terminating in suitable connection terminals, of a line signal normally connected to the telephone line, a plug-cord circuit adapted to be connected to'the said line, a supervisory signal circuit, a supervisory relay associated with a main strand of the said plug-cord circuit, the said relay being provided with two armatures, one of the said arniatures being adapted to close a contact in the supervisory signal circuit, the other said armature being adapted to open a contact in the said super- 'visory signal circuit, a central source of elec-- trinity associated with the said relay and with the plug-cord circuit, means whereby when connection is made with the said calling line the circuit of the said source is closed through the said relay, therebyvactuating its arinaturcs and maintaining' an open contact in the said supervisory signal circuit, the supervisory relay circuit including a main strand of the plug-cord circuit and a limb of the telephone line, with a suitable return, and incans on the line for operating one armature of the supervisory relay and thereby closing a contact in the supervisory signal circuit to display the supervisory sip;- nal. sub tantially described.

12.111 a telephone system, the-combination nith a metallic, alling, telephone line tcru'linating in suital'zle connection terminals, of a line anal normally connected to a limb of the telephone line, a central source of elect ici'ty normally connected to the other liml: of the telcplione'linc, a plug-cord circuit aijlaptcd to be connected to the limbs of the said line a supen'isory signal circuit, a supervisor-v relay associated wita a main strand of the said plugrord circuit, the said lJlHY being provid d with two armatures; one of th said armatures being adapted to close a cert-act in the supervisory signal circuit, the other said armature being adapted to open a contact in the said supervisory signal circuit, the said central source of electricity being also asociated with a main strand of the plug-cordcircuit and with the said relay, means whereby, when connection is made with the said calling line, the circuit of the said source is closed through the said relay, thereby actuating its armatures and maintaining an open contact in the said su--' pcrvisory signal circuit, the supervisory relay circuit including the main st ands of the plugcord circuit and the limbs of the telephone line, and means on the line for operating one armature of the supervisory relay and thereby closinga contact in the supcrrisory signal circuit to display the supervisory signal, substantially as described.

13. In a telephone system, the combination with a telephone line terminatingin suitable connection terminals at the central station,

of a high-resistance line-signal lamp normally connected toa limb of the said line, a cut-oil" relay included in a talking limb of the said line and adapted to disconnect the said line-signallamp from the telephone line when in an operated condition, a subscribers sub-station connected to the said telephone line, a plug-cord circuit adapted to be conductirely coinie'cted with the telephone line, a supervisory signal lamp associated with the plug-cord circuit, a double armature supervisory relay connected to a main strand on the plng-cord circuit, one armature thereor" being adapted to close a contact when actuated, the other armature thereof being adapted to open the same contact when actuated, a divided source ot'elotriclty associated withthe line-signal lamp. the cord- -c1rcu1t, the supervisory relay and the super visory-signal lamp, the said sm'gervisoiy-signal lamp being in circuit with the said contact of the supervisory relay, means or closing a circuit of the said source through the line-signal lamp and a limb of the telephone line, with a suitable return, at the said sub-- stat on, and thereby lightingthe said linesignal lamp, means for closing, the circuit of a portion of the said source through the said supervisoryrelay, a talking strand of the plug-cord circuit, a main terminal of the connecting plug, a main line terminal, a winding of the said cut-oil relay and a limb of the telephone line, with a suitable return, when connection is made with the line and the said line is connectedthrouph the substation.' therebyactuating the said cut-oft relayand thus disconnecting the linasignal lamp from the telephone line, and also actuating both armatu'res of the supervisory relay and thus naintaining an open contact in the said supervisory lamp circuit, and means-for closing a circuit of antther portion of the said source through the said ellof the cut-off relay and the line-signal lamp, when the circuit of the telephone line .is'

broken at the sub-station and connection is made with the said line, and thereby actuating one of the armatures of the supervisory relay and thus closing'a contact in the supervisorylamp circuit and causing the said sir pervisory-signal lamp to light, substantially.

as described.

, 14. In a telephone system, the combination with a metallic telephone line terminating in suitable connection terminals at. the

central station, of a high-resistance line-Sig,

nal lamp normally connected to one limb of the said line, a divided source of electricity normally. connected to the other limb of the said line, a cut-0E relay the windings of which are included in the respective talking limbs of the said line, the said cut-off relay being adapted to disconnect the said linesignal lamp and the said source from the respective limbs of the said line when in an operated condition, a subscribers sub-sta-.

tion connected to the limbs of the telephone line, a plug-cord circuit adapted to be conductively connected with the respective limbs of the telephone line, a supervisory signal lamp associated with the plug-cord circuit, a double-armature supervisory relay connected to a main strand of the plug-cord circuit, one armature thereof being adapted toclose a contact when actuated, the other armature thereof being adapted to open the same contact when actuated, an impedance coil connected 'to'a second main strand of the lug-cord circuit, the said divided. source of e ectricity bemgalso associated with the line-signal lamp, the said impedance-coil,

' the supervisory relay and the supervisorysignal lamp, the said supervisory-signal lamp being in circuit with the said contact oi n supervisory relay, means for closing a :uit of the said source through the linesignal lamp and the limbs of the telephone line, atthe said sub-station, andthereby lighting the said line-signal lamp, means for closing a circuit of a portion of the said source through the said supervisory relay,

- the talking strands of the plug-cord circuit,

the main terminals .of the connecting, plug, the main line terminals, the windings of the said cut-01f relay, the limbs of the telephone line and the sub-station apparatus, when. connection is made with the-line and the" said line is connected through the sub-station, thereby actuating the said cut oii relay and thus disconnecting the line-signal lamp 1 and the said source from the respective limbs of the telephone line, and also actuatin both armatures of the said supervisory,

re ay and thus maintaining an open contact in the said supervisory lamp circuit, and means for closing a circuit of another portion of the said source through the said supervisory relay, a talking strand of the plug-cord circuit, a main terminal of the connecting plug, a main line terminal, a winding of the cut-off relay-and the line-signal-lainp, when thecircuit of the telephone line is open and connection is made. with the said line, and thereby actuatingonly one of the armatures of the said supervisory relay,.and

thus closing a contact in the supervisory ;-cuits, a double-armature supervisory relay for each connecting plug and associated therewith, the said relays being adapted to control the respective supervisory signal circuits and thereby control the operation of thevsupervisory signals, a source of electricity associatedwith the said supervisory relays and signals and with the said lines armatures of either supervisory relay separatelyor together, during the process of connectmg and disconnectmg'the said telephone lines for conversation over the said lines, substantially as described.

and line signals, and means for operating the 16. In a telephone systemathe combina-- tion with two telephone lines extending from respective subscribers stations to the central station, of a line-signal lamp for each line and normally connected thereto, a cut-off relay for each line and associated therewith, the said relays being adapted to disconnect their respective line signals from the said respective telephone lines, when in an operatedcondition, a cord circuit terminating in two connecting plugs and adapted to be conductively connected with the said lines, supervisory signal circuits, a double-armaplug the armatures of which are adapted to control the circuits of the corresponding supervisory signals and thereby control the operation of the said signals, a divided source of electricity associated with the said supervisory relays and signals and with the said lines and linesignals, means for connecting'the said telephone lines through the said cord circuit tofacilitate conversation between the saidlines, and means for oper ating the said line signals and supervisory signals by means of the said relays during the process of'connecting and disconnecting the said telephone lines for conversation over the said lines, substantiallyas described.

' 17. The combination with a telephone line and connection terminals therefor, of a line signal normally connected to the said line, a

ture supervisory relay for each connecting plug-cord circuit adapted to be conductiv'ely connected with the said line, a double-armature relay associated with the plug-cord circuit, a supervisory signal, a source of electricity associated with the'plug-cord circuit and with the said line, means for operating the said relay armatures separately or togcther and thereby operating and controlling a local circuit containing the supervisory signal. means wherebythe said line signal is under control of the subscriber when no connection is made with the line, means whereby the said double-armature relay is under control of the said subscriber and means whereby the said line signal is rendered inactive, when connection is made with 18. The combination with a'telephone line and connectionterminals thercfor of a line signal normally connected to the said lineya cut-oil relay associated with the said line and adapted to disconnect the said line signal from the said line, a plug-cord circuit adapted to be conductively connected with the said line, a double-armature relay associated with the plug-cord circuit, a super visory signal, a source of electricity associated with the plug-cord circuit and with the said line, means for operating the arniaturcs of the double-armature relay separately or together and thereby operating and controlling a local circuit containing the supen visory signal, neans whereby the said line signal is under control of the subscriber when no connection is made with the line, and means whereby thesaid double-armature relay is. under control of the said subscriber when connection is made with the telephone line substantially as described. f 19. The combination with a telephone line andsuitablc connection terminals therefor, ot' a line signal associated with the said line, a pluo cord circuit adapted to be conductively connected with the said line, a supervisory signal circuit, a double armature supervisorv-relay adapted to operate and control the supervisory signal, a divided source of electricit asoeiated with the said plu ;'cord circuit, the supervisory relay and the telcplmne line, inc-ins tor-closing a circuit of a portion otfthe divided source through the said supervisory relay and thereby sending a current through he said relay in one direction and thus an. a one of its armatnres, and means for closing a circuit or another portion ct the said divided source through the said snprrisory relay and thereby sending a. current through the said r lay in the opposite direction and thus actuating the other 2i!1:-:;l'nrc :ln'rcoli tiasaid armaturcs control" Q a contns super isory signal circuit, substantia E.l- 21), file combination will a telcphone'line terminating in suitable conc tion terminals,

of a subseribers station connected to the said line, a line signal normally connected to the said line, a cut-oii relay associated with the said line and adapted to render the said line signal inoperative when in an actuated condition, a plug-cord circuit adapted to be con ductively connected with the said line, a supervisory signal, a double-armature relay as Isociated with the plug-cord circuit and adapted to operate and control the supervisory signal, a divided source of electricity associated with the plug-cord circuit and with the telephone line, and, means whereby the subscriber reverses the current through the said supervisory relay by openingand closing; the cir cult of the telephone line while connection is made therewith. thus actuating and controlling the operation of the armatures of the supervisory relay, respectively, and thereby controlling the operation of the supervisory signal. substantially as described.

21. In a connecting circuit for telephone lincs, an electrical]y-operabledevice normally associated therewith and provided with operable members for controlling a signal circuit, a signal circuit to be controlled, and means for operating the operable members separately.

22. In a connecting circuit for telephone lines, an electrically-operable device normally associated therewith and provided with operable members for controlling a signal circuit, a signal circuit to be controlled. and means for operating the operable members separately or together;

The combination with a plug-cord connecting circuit for telephone lines, of clectrically-opcrable devices normally associatcd therewith, each device beingprovided with operable members for controllinga signal circuit suitable signal circuits to be operated, and means for operating the operable members of either device, separately or together.

24. In a connecting circuit for telephone lines, a relay normally associated therewith and provided with armatures for controllinga signal circuit, a signal circuit to be controlled, and means for ope 'ating' the said arnnitnrcs separately. 7

T he coinbimition with a-connccting circuit for telephone lines of a relay normally associated therewith and provided 'with armaturcs for controlling a signal circuit. a signal circuit to be controlled. and means for operating the said arinaturcs separately or together.

L'ili. The combination with a plug-cord conntcling circuit for telephone lines, of re- ,l:: vs normally connccl'cd thcrcv-cith, cach re iaturcs for conlay being providcd with arn trolling a sigl'nal circuit. sin

ing the armaturcs of either re ay. scpa' or together.

rnal Gil:- mutant-- -27. The combination with a connecting circuit for telephone lines, of an electromagnet normally connected therewith and provided with operable members for controlling a si nal a si nal to be controlled and means 'for operating the operable membersseparately or together.

- i 28. The combinationwith a connecting circuit for electrical transmitting circuits, of

electroinagncts normally associated there-' ;..5 with, each electromaguetbeingprovided with operable members for controlling a signal, suitable signals to be controlled, and

-. n)eans for operating the operable members of'each magnet, separately or together. 2,9. The combination with a telephone line,

I of a plug-cord circuit adapted to be conductivcl'y connected therewith, a double-armature,r elay normally associated with the plugcord circuit, circuit-controlling .means adapted to be operated by either armature,

.a signal under control of the circuit conthe other armature opening it, or vice versa,

a suitable local circuit for the switch, and means for operating the said armatures separately or together.

. 31. The combination with a telephone line,

:of a connecting circuit "therefor, a doublearmature relay associated with the connecting circuit, a' local circuit adapted to be closed and opened by either armature of the relay, and means for operating the said armatures separately or together. 32. The combination with a connecting circuit for electrical transmitting lines, of an 4 electrically-operable device normally asso ciated therewith and provided with operable members, circuit controlling means adapted to be operated by the said operable members, a suitable circuit to be controlled by the circuit controlling means, and means for oper-. ating the said operable members separately or together.-

33. The combination with a connecting circuit for telephone lines, of a double-armature relay normally associated therewith, a spring contact adapted to be 0 ned or closed by either armature of the re ay, :1 suitable circuit to be controlled by the spring contact, and means for operating the said armatures, one at a time or both together.

34. Thecombination with a connecting circuit for'telephone lines, of a double-armature relay normally-associated therewith, a

- contact in a signal circuit adapted togbe opened or closed by either armature of the relay, a suitable signal circuit to be. controlled by the said contact, and means for operating the said armatures separately or together. V e

35. The combination with'a connecting circuit for electrical transmitting lines, of an electrically-operable device normally associated therewith and provided with operable members, switching mechanism adapted to be operated by the said operable members, a signal adapted to be'operated by the said switching mechanism, and means for operating-the said operable members separately or together.

36. The combination with a connecting circuit for electrical transmitting lines, of an electromagnet normally associated therewith and provided with superposed armatures,

circuit-controlling means adapted to be operated by either said armature, a signal cirzCIllt to be controlled by the circuit-controlling means, and means for operating the said armatures separately or together.

37. The combination with a connecting circuit for telephone lines, of a relay normally associated therewithand provided with'superposed armatures, a switch adapted to be opened or closed by either said armature, a suitable signal circuit to be controlled by the switch, and means .for operating the said armatures, one at a time or both together;

38. The combination with a telephone line and-a subscribers telephone connected thereto, of a plug-cord connecting circuit adapted to be connected with the line, a relay provided with superposed armatures and normally associated with a main strand of the plug-cord circuit, a sourcejoftelectricity associated with the plug-cord circuit and. with the telephone line, circuit-controlling springsadapted to be operated by the said armatures, a signaling device in circuit with the said springs, and means forop'eratingthe armatures of the said relay,one at a time or both togetheT, and thereby controlling the operation of thesaid signaling device, one said armature being under control of the eubscriber when connection is made with the me. r

39. The combination with telephone lines, of a plug-cord connecting circuit terminating in connecting plugs and adapted to be connected with the said lines, a relay for each plug and normally associated therewith, each said relay being provided with a pair of superposed armatures, circuit con trolling springs for each relay adapted to be operated by the armatures thereof, signal circuits controlled by the respective relays, a source of electricity associated with the said lines and relays, and means for operating the armatures of either said relay, one at a time or both together, and thereby controlling the respective said' signal circuits, one said armature of each relay being under In I ll ll lines, substantially as described.

control of respective line operating means when connection s made with the respective 40'. In a connecting cii'cuit ior electrical transmitting lines, an electrically-operable device provided with operable members for:

controlling a, circuit, .a signaling circuit adapted to be controlled by the said operable members, and means fonoprating the said operablemembers' separately,

adapted to be c'ontrolledby the 'said' arma-' tures, and means whereby the said armatures may be operated separately or tc'wgether. I 42. The combination withv a telephone line, ofv a connecting circuit therefor, an

electrically-'0 erable. device normally associated with tie connecting circuit and provided with operable members for'controlling a signaling circuit, a signal ng circuit to becontrolled, and means on the line for controll ng the operation of one of the said op ferable members while connection is made withthe'line, separately from the'operation of another said operable member.

43. The combination with a telephone line, of a connecting circuit therefor, an

electrically-operable device normally associated with the connecting circuit and provided with operable members for controlling a signaling circuit, a signaling circuit to be controlled, means whereby one said operable member is operated when connection is made with the line, and means on the line controlling the operation ofan'other said operable member while connection is made with the line. 44. An electrical system. having lines, a connecting circuit for the lines, an electrically-operable revice normally associated with the connecting circuit and having operable members for controlling a signaling circuit, a signaling circuit to be controlled, and means for sending current through the said device from a plurality of circuits tov operate the said operable members separately.-

45. An electrical transmitting line. a connecting circuit therefor, an electrically operable devicc associated with the connecting circuit and having operable members for controlling a signaling circuit, a signaling circuit to be controlled. means whereby one ofthe said operable me. :bers is operated when connection made wizh the line. :nd means whereby another Fxlll operable memher is under control of lhe line while connection made therewith.

46. The combination with a connecting circuit for electrical transmitting lines. of an elcctrically-operable switching device normally associated therewith and having 47. In a connecting circuit whereby" diife'rent degrees of energy in the gsaid ide'vice control difierent portions of the switeh coiitr ollingg mechanism.

ciated therewith and provided with operable mechanism tor controlling circuit arrangeoperate diilerent'p ortions of the said mecha nism separately.

f 8. The combination with a telephone'line,

ofa'connecting circuit therefor, a relay normally associated with the connecting circuit and provided with operablemechanism for v for. electrical transmitting lines, a relay normally assocontrolling suitable circuit arrangements,

suitable circuit arpangements to be controlled, and means on the line for causing the relay to operate a portion of the said mechanism wliile connect1on is made with the line, separately from another portion'of the said mechanism. g T

49. .The combination witlratelephone line,

- of a connecting circuit therefor, a relay normally associated with the connecting circuit and provided with bperable members for controlling suitable circuit arrangements,

suitable circuit arrangements to be controlled, means whereby the -.relay operates one said operable member when connection is made with the line, and means on the line causing the relay to operate. another said operable member while connection is made with the line.

'50. An electricalsystem having lines, a connecting circuit for thelines, a relay normally associated with the connecting circuit and having operable members for controlling suitable circuit arrangements, suitable Cir-- cuit arrangements to be controlled, and

means whereby the circuit arrangement of the systemcmay be changed to vary the current supply through the said relay to operate the said operable members separately.-

.51. A telephone line signaling circuit having a signal lamp in series with "the line with a small enough current-carrying capacity whereby it may be lighted in series with a line resistance of at least fivelumdrcd ohms to give a signal and also through a short-circuit of the line resistance without burning out.

The combination of an electrical circuit havinga make and break contact therein, a relay having arniatui'es, and means adapting each armature to open and close the said contact when the relay is properly energized. s

5:3. The u-xubinution of an electrical circuit having an operable contact therein, a relay having a plurality of operable members, and means for-causing the relay to operate the said operable members separately 1 rent not exceedingapproximately five-one tact.

i i. A" telephone line signaling circuit coiii 'irising'a l ne, signal lamp and source of electricity connected in series, the parts of the circuit being proportioned .so that a curlllllllllldtlls of an ampere may be used for causing 'the display of the signal.

"55. A telephone-line signaling circuit comprising a line, signallamp and source of electricity connected in series, the parts of the circuit being proportioned so that the current through the lamp iskeptat a value not toexceed approximately five-one-hundredths of'an'ampere, for signaling purposes.

56JThe combination of a telephone line extending to acentral station, connecting means for the line, a relay normally associated with the connecting means and provide d with operable mechanism for controlling suitable circuit arrangements, suitable circuit arrangementsto be controlled, and means on the line for causing the said relay to control the operation of a portion of the said mechanism fwhile connection is made With the line, separately-from another portioniof the said mechanism. g

57. 'Thecombination of an electrical trans- 'mitting line'extending to a centralstation',

4 connecting means-for the line, a relay norline for causing the said relay to control a'.

mally associated with the connecting means and providedwith mechanism for controlling a signaling circuit, a suitable signaling circuit to be controlled, and means on the portion of the said mechanism while connection is niade"--u'ith the line, separately .from'another portion of the said mechanism.

58. The comhination of a telephone line extending to 'a-'-central station, connecting means for the line at the central station, a'

' relayhnofinally. associated with the connecting means and having a plurality of armatures for controlling suitable circuit 'arrangenieiits, suitable circuit arrangements to be controlled, and means'on the line for controlling the operation of one of the said arinatures while connection is made with the line,'separatelvfroin another of the said arin'atures. 7

59. TllGCOlllblIHltiOll of a telephone line extending to a central station, connecting means for the line, a'relay normally associated With the connecting means and having a 'pIui-ali'tv of ar natui'es operable sepa: rately' 'upon' difi'ei 'ent degrees of energy n the relaygswitching mechanism adapted 'to beop'erated by the armatnres, signaling means-1 adapted to be controlled by the switchingmechanism, andmeans on the, line forflvaryingtlie energization' of the relay while connection is made with the line, to control the operation ot one of the-said arwhereby each opens and closes the said con- 6 6. In aconnecti relay.

matures separately from another of the said armatures, during such connection.

160. In a telephone line-signaling system,

ohms, or a signal lamp 'connectedinseries the combination With a" telephone linehav- I, mg a resistance ofv atleast"five-hundred' with the line, and means for lighting the lamp over tli'eline to give a signal, the said lamphaving' a filament with a currentrar-I' rying capacity' not exceeding approximately it prevented from burningout-upon a diminution of the line resistance of at least five-hundred ohms.

61. In a telephone line-signaling circuit comprising a telephone line and a lamp connected in series, a higli-specific resistance' filament for the lamp wherebythe latter may be lighted over the line, to give a signal, through various line resistances varying through a range of at least five hundred ohms, ona voltage suitable for such a line."

62. A telephone line-signaling system five one-hundredths of an ampere whereby" comprising a telephone line having a signal lamp connected in series therewith and means for lighting the lamp over the line to give a signal, the said lamp having a filament with a current-carrying capacity not exceeding approximately five jo'ne-liundredths of an ampere whereby'fit is prevented from burning out upon a short-circuit of theline resistance.

63. A telephone line extending to a'central station and having a resistance of at least'five hundred ohms, and a small our rent-carrying capacity signal lamp at the f,

central station ada ted and arrangedto be lighted in series With the line and also througha short-circuit of the line resistance atthe central station.

suitable for such systems.

on a source of current 64. In a connecting circuit for electrical transmitting lines, a switch, a translating device under control of the switch, a plurality" of operable members each adapted and arranged to open and close the switch,

and means for operating the said operable members separately.

. 65. In a connecting circuit for electrical transmitting lines, a switch adapted to be opened and closed, a signal-init-iatingdevice under control of the switch, a plurality of mechanisms each adapted for opening xiio andclosing the switch, and means for causing the operation thesaid mechanisms separately, I

spective' electrical eii'ergiZation s in the said 67 In a telephone system having a supervisory signal, an electromagnetic device for controlling the signal, the said device havmg a switch connected with said signal and a plurality of: armatures each adapted to open or close said switch, and means for operating the said armatures separately as desired.

68. A supervisory signaling circuit of the having a make and breakcharacter specified contact therein, an electrically-operable device having armatures, and means adapting oneof the said armatures to close the said contact and another'of the said armaturesfto open the said contact, uponftheproper ene'b gization of the said device,"

.69. A supervisory 'gnaling circuit of the character specified having an operable contact therein, an electroresponsive dev ce hav-' ing a plurality of operable members, and means adapting one of the said operable tion of the said device. 7 v 70. The combination with a telephone line, of a connecting circuit therefor, an. electroresponsive device having a plurality of armatures and associated with the con meeting circuit, a supervisory signal circuit adapted to be controlled by the .said armatures, one ofthe said armatures being adapt ed to close a contact affecting the said signal circuit and another of the said armatures being adapted to open a contact afiecting the said signal circuit, and means for operating the said armatures separately.

71. The combination with a telephone line, of a connecting circuit therefor, a re-.

lay device having a plurality of armatures and associated with the connecting circuit, a supervisory signal circuit adapted to be ontrolled by the said armatures, one of the said armatures being adapted to close a contact in the said signal circuit and another of the said armatures being adapted to open a contact in the said signal circuit, and means for operating the said armatures separately. 72. Id a connecting circuit for telephone lines, a supervisory signal, a relay for controlling the said signal, means for energizing the relay as desired, and means whereby different degrees of energization of the said .relay cause the display of the said signal and render same inert, respectively.

73. In a connecting circuit for electrical transmitting lines, 'a translating device, a normally unenergized electroresponsive device having an energizable member, for controlling-the said translating device, means for energizing the said eleetroresponsive de- ,vice as desired-and means whereby difi'ercnt degrees of energization affecting the same energnzable member of the said electroresponsive dev1ce,'cause the actuation of the said translating device and render same inactive, respectively.

74. In a telephone system having lines, a

connecting circuit for the lines, a switch, a

supervisory signaling device under control of the switch, ele'ctroresponsive mechanism;

having a plurality of armatures each adapted and arranged to open and closethe switch, and means for causing the operation 'ofthe said armatures separately to suitably control the said signaling device. 75. In a connecting clrcuit for telephone systems, an electrically-operabledevice havinga plurality of primary operating members, switching mechanism under control of the said members, signal-initiating means under control of the said-switching mechanism and means for operating the said members separately to suitably control the said signal-initiating means.

76.. In a connecting circuit for telephone systems, arelay having aplurality of armatures operable separately upon different de grees of energy in the relay, switching mechanism under control of the armatures, si

nal-initiating means under control of t e switching mechanism, and means for energizing the relay to operate the armatures separately as desired.

77. The combination with a connecting circuit for electrical transmitting lines, of

an electrically-operable device normally as- .soc-iated therewith and provided with super posed operable members, signaling mechamsm adapted to be controlled'by the said operable members, and means for operating the said operable members separately.-

78. 'An electrical circuit having 'acontact therein, a unitary electromagnet having a plurality of operable members, and means for causing the magnet to operate the said operable members separately whereby each control the. said contact.

79. The combination with a telephone line, of a connecting circuit therefor, an electroresponsive device, having a plurality of armatures and associated with the connecting circuit, a supervisory signal circuit, each of the said armatures being adapted to control a contact affecting the said signal cir cuit, and means for operating the said armatures separately.

80. The combination with a connecting circuit for telephone lines, of a supervisory signal circuit, and a unitary super 'iscry magnet for exercising sole control o er said supervisory signal circuit under proper circuit connections, said magnet having-a plurality ot armatures operable separatei ffor controlling said signal circuit.

81'. The combination with a connecting circuit for telephone lines, of a supervisory signal, and aunitary supervisory magnet for exercising sole control over said supervisory signal, said magnet having mechanisms adapted to be given separate actuations upon magnet, for

respective energizations of the controlling the said signal. v

82. The combination in a telephone system, of a-sign'al circuit, and a unitary magnet for exercising sole control over'said Sig nal fcircuit, said magnethavmg a plurality said device, for

of armatures operable separately for'contion of the said device, for properly controlling the said signalcircuit.

84. Ina connecting'circuit for electrical transmitting lines, suitable circuit portions to be controlled, a supervisory signal assoelated With a said circu t portion, and are lay for controlling the said circuit portions,

the said relay having operable mechanism adapted to assu me two operative positions, besides normal position, upon the'proper encontrolling the said circuit nal.

ergization of the said relay, forproperly portions and s1g- 85. In a connecting circuit for electrical transmitting lines, a supervisory signal cir-" cuit, and an electrically-operable device for controlling the said signal circuit, the said device having contacts adapted to assume" two operative positions, besides their normal position, upon the proper energization of the properly controlling the said signal circuit. i

8 6. In a connecting circuit for electrical transmitting lines, suitable circuit portions to be controlled, a supervisory signalcon nected with, a said circuit portion, and a relay for controlling the said circuit portions, the said relay having-contacts adapted to assumetwo switchingpositions, besides their normalposition, upon. the'proper energization of the. said relay, for properly controlling the said circuitportions and signal.

'87. In a connecting circuit forelectrical transmitting lines, a supervisory signal circuit, a nd. a1 relay device for controlling the,

said signal circuit, the, relay device having contacts adaptedto assume .a plurality of positions besides their normal position, upon the proper energiaation, of the said relaydevice, the latter aiso -havinga plurality of rniatures operable separ 1y .for properly. controlling the said you ta circuit'gtfor electrical transmitting lines, of a relay normally associated therewith and having :Witclrcontiolling' mechanism, suitable circuit portions to be controlled, and

meansv whereby different degrees. of energy in the relay control difierent portions of the said switch-controlling mechanism.

89. The combination with a unitary electromagnet' included i'nja'n operating circuit therefor, of a local signaling circuit under control of the magnet, thelatt'er having two .ar atures operable separately upon difierent degrees of energizationjof the magnet, and switching mechanism in series" in the said local circuit and under control of the said armatures whereby each of the said armatures controls the said local circuit. 1

90. In a telephone system,a telephone linej extending to a central station, a signal at the central station, a non-polarized electri Cally-operable device at theceiitral" station for controlling the said signal, the'saidde vice having a switch contact controlling the circuit of the said signal and [mechanism controlling the said sw tch. contact, and means for causing the said device to give the said sivit ch'contact. o.

91. In a connecting circuit for telephone systems, a relay having a plurality ofarmatures and switching mechanism controlled by the said armatures, suitable circuit arrangements under control of thesaifil switch} ing mechanism, and means.forcausing the relay to operate the sa d armatures jsepae rately upon the proper energization thereof,

whereby thesaid armatures properly control:

the said switching mcchanisn'i;v

92. An electrical circult having 'a ,make-,

and-break contact therein, af.unitary' electro-.

magnet having armatures. adapted. to -be operated separately, and means adapting one of the said armatures to closethe saidcontact and another of the said arinatures' to open the said contact, upon the proper encrgization of the magnet.

fee

said mechanism a plurality of operations upon different degrees of 'energization of the said device, each operation ofthe said mechanism causing a different control of the 93. The combination of a signal circuit and a unitary magnet for excrci'singcontrol over the said signal circuit, the said ,n ag';

net having a plu'rality of armatures exterior' of the said circuit and operable separately.

for controlling the said signal circuit;

94. In a connecting circuit for telephone systems, an electrically-operable devicehavq mg a plurality of primary operating members and switching mechanism under control thereof, suitable circuit portions under control of the said switching mechanism, and means for operating the saidprimaryfoper ating members separately tosuitably control Sthesmd circuit portions.

9 5. A signaling systemiconiprisingjaj iline and a signal lamp connected'in series there with, thcisaid lamphavingafilainent with a current-carrying capacity not -exceeding approximately five one hundredths ofan am:

pere, and mea-ns-for 'lighting the lamp over ,the line togive'asignal'. I

96;In. atelephone system, the combine tion with a telephone circuit at the central ofiice (if-the system, of a relay connected with said circuit, said'relay adapted to be partially a'ctuatedover said circuit at one time to aifecttelepho'ne apparatus and completely actuated at another timeto again affect said apparatus, substantially as described.

97. The combination. in a telephone exchange system -ofr agcord circuit adaptedito make connectionwith'a' telephone line, a signal controlling electromagnet' associated therewith responsive to: current in a circuit established 'bythe' con'nectionof said cord circuit to the line {means'for securing'a li nited energization: only ofsaid electromagnet during thenonnse of the line to cause the display of a signal, and means forsecuring a greater energization of said electromagnet when the line is in usewhereb-y the said signal is etiaced, substantially as r-described.

98,111 a telephone exchange system, the

combination of a cord circuit adapted to make connection -witha' telephone line, a

signal controlling electromagnet associated therewith adapted to dlsplay a signal only when partially energized and to efface said elated therewith and adapted when energized to a limited extent to display its signal and when energized'to a greater extent to efface said signal, substantially as described.

100. In a telephone system, the combinationwith a telephone line, of\, a cord circuit to establish connections therewith for conversation, a supervisory relay associated with the cord circuit and having its circuit completed through auhigh l esistance path when connection is made with the line and the subscribers telephone is not in use, to

partially operate the relay, a supervisory signal displayed by said apparatus at this time, and means for completing a lowresistance path for said relay when connection is made with the line and the .subscribers telephone is in use to completely operate the said relay to thereby efi'ace said supervisory signal.

101. In a telephone system, :the combination with a telephone line, of a cord circuit to establish connections with the line for conversation, a cut-elf relay for the line adapted to render the line signal inoperative when a connection'is established, a: super visory relay associated with the cord circuit, means for establishing a path for current through said supervisory and ,out-ofl relays when a connection is established with" the linei to partially operate the supervisory relay, a supervisory signal having its circuit 'closedduring such'period of partial opera.-

tion of the supervisory relay, and means whereby when the subscribers telephone is a in use an increased How of current through said supervisory relaycompletely operates the same and thereby renders'the supervisory signal inoperative.

102. In a telephone system, thecombination with a telephone line, of a cord circuitto, establish connect1ons for conversation therewith a su ervisor rela associated with the cord circuit, a central sourceof current to furnish current over the telephone hne for conversation, said relay being partially operated during the connection when the subscribers telephone is not in use,

to operate the supervisory signal, the said relay being in the path of current over. the

telephone line when the telephone is in use I whereby the relay is then completely operated to render thesupervisory signalinoperative.

103. In a telephone system, the combination with the connecting circuit at the central oiiice of the system, of a relay connected with said circuit, said relay being adapted and arranged to be partially actuated over said circuit at one time to aliect telephone apparatus and'completely actuated at another time to again affect telephone apparatus;

104. In a telephone system, the combina-.

tion with a telephone line, of a cord circuit to establish connect-ions therewith for conversation. an electromagnet associated with the cord circuit and having its circuit completed through a high resistance pathwhe'n a connection is established by. the cord-lcin' cuit with the line and thefsubscribers'telephone is not in use, to partially: energizethe said magnet, supervisory apparatus controlled by said electromagnelg, and means :for

completing "a low resistance'path through said electromagnet when the .subscriberls' telephone is in use to fully energize'the said magnet to again afiect said apparatus.

105. In a telephone system, the combination with a telephone line, of a cord circuit to establish connections with the'line for conversation, a cut-off device for the line adapted when operated to render the line signal inoperative, a supervisory signalcontrolling magnet associated with the cord circuit, a suitable signal adapted to be controlled thereby, means for establishing a path for current through said magnet and sociated therewith and adapted when energized .to .a limited extent to display its Sig nal and when energized to a greater extent to efiace'said signal, an energizing winding for's'aid electromagnet in a circuit normally under control of the operator adapted to securethe limited energization of said electromagnet, and means whereby the substation may secure either the limited or greater energization of said electromagnet when the line-is switchedfor conversation.

115. Thecombination in a'telephone exchange system of a telephone line uniting a substation with a central oifice, a cord circuit-adapted to makeconnection with said line, a signal-controll ng electromagnet associatedtherewith andladapted when energized to a limited extent to display its signal and when energized to a greater extent to efiace saidsignal-, iii-circuit under control of the operator-including an energizing winding of" the electromagnet adapted .tosecure thelimited energization of said electromagne't, and a switch at the -substationfiir controlling an increased flowof current through'said el ectromagnet when the.

7 line switched for conversation. I

116; In a'telephone exchange system, the combination of a subscribers line free from operative earth connections outsideof the exchange, a link conductor associatedtherewith, a non-polarized electromagnet, a nor mally cifaced supervisory signal and a source'of current all associated with said dink conductor, a path 1 under the control of the operator for causing a flow of cur-f rent through said magnet. and to cause the 'display of said signal, and a branch path for QZQDlB through said magnet for in- [creasing the energization of the said magnet, directly controlled by the subscriber mally efiaced, supervisory signal and a,

when said link conductor is connected with said'line and adapted to cause the eil'ace ment of said signal.

117 In a telephone exchange system, the combination or a subscribers line free from operative earth connections outside of the exchange, alink'conductor associated there, with, a non-polarized e1ectromagnet, a norsouroe of current associated with said link] conductor, a pathvunder the control of the operator'forcausingi a fiow of current "through said magnet-to cause the display of said signah i'and a branch path for current directl controlled-by the subscriber when said link conductor is connected with 'mentof said signal-by increasing the en;

118'. In a telephone exchange system, the

combination or cord connecting apparatus adapted to make connection with a converse:

tional'c'ircuit, a signal assocmted with said line, of a connecting circuit therefor, an eleccuit.

'tion with a telephone circuitextending to} I cord connecting apparatus, 'an electromagnet also associated with said cord connecting apparatus, adapted to cause the display of said signal by the "'energization of said electromagnet when said apparatus isassociated with an idle circuit and to prevent thev dis-'- play of the signal by an increased energizetionof saidelect'romagnet while said circuit is'in use.

119. The combination with a telephone trically-operable device associated with the connecting circuit and provided with operable members for controlling a signaling cir- 1 cuit, a supervisory signaling circuit to be controlled by the said operable members, 1 means whereby one said operable member is attracted when'cohne'ction is madewith the f line, and means on the line controllingfthe attraction of another said operable member" while connection is made vfitkthedixie, to control the said supervisory signaling-cir- 120. In a telephone system, the bombina- 0 the central ofice of the-system, of .a relay deyice at the central olfice adapted and ary ranged tobe partially actuated over a local circuit at the central ofliceat one time to afi'ect' telephone apparatus and completely? .9 5 I actuated over anotherv circuit at anothertime 'to affect telephone apparatus 121.7 In atelephon'e systemfthe combina- "tion witha telephone line circuit extending to the centraloilice of the system, of a relay; 0 1 I- device at 'the'central ofiice adapted and an ranged Vito be connected with the line when connection is made therewith and to. be partially. actuated at one time to .afi'ect telephone apparatus and com letely actuated at 5 another timeto again 21* cot the said te1e-.

1 phone apparatus.

'122. In a telephone system having lines extending to a central station, a signalat the central station,- relay mechanism at the 0 central station for controlling the signal, and mechanism. on a 'linefor controlling the said relay mechanism at-a certain time, the said relay mechanismvhaving a plurality of armatures operable separately for con 5 trolling the said signal, p

123. In a telephone system having lines extending toa central station, a signal at the central station, relay mechanism at the central station for controlling the signal, the said relay mechanism being adapted to be connected with a line, when onnection is made therewith, and mechanism on a line for controlling the said relay mechanism at a certain time, the said relay mechanism having a plurality of operable members operable separately for controlling the said signal. l

124. In a telephone system having lines extending to a central station, a signal at the central station, relay mechanism at the con tral station for controlling the signal, and

mechanism on a line for controlling the said "relay mechanism at a" certain time, the said any mechanism havinga-contact for con-. "trollingthe said signal and a plurality of ling the saidrontact;

- 125. In a telephone system having lines extending to a central station,'a signal at the central station, relay mechanism at the cenarmatnres operable separately for controlt'ral station for controlling the signal, and

mechanism on a line for controlling the said relay mechanism at a certain time, the said relaym'echanismhaving a contact for controllmg the said signal'and a plurality of operable members operable separately for controlling the said contact.

126 In a telephone system having lines ntendingto a central station, a signaling device at the central station, rclay'mechamsmat the central station having a' plurality of 'armatures operable separately for controlling the said signaling device, means at the central statlon for controlling one oi: tlie sa'i'd"armaturesyanclmechanism on a line tor controlling another of said armatures,

:whercby the'said signalingdevice is propcrlycont-rolled 127. In a telephone system having lines extending to acentral station, a signaling device at the central'sta'tion, relay mechanism at the central station having a contact for controlling the said signaling device and a'plurality of armatures operable sepa rately for controlling the said contact,means atthe central station for controlling one of. the said armatures and-mechanism on a line' forcontrolling another of said armature's, whereby the said signaling device is prop erly controlled.

128. Ina telephone system having lines extending to a central station, a signaling device at the central station, relay mechanism at the central station adapted to be extending to'a central station, a'signalingi device "at the central station, relay mechanism at the ccntral'station haying a contact I for controlling the said signaling device and a plurality ot operable members operable separately for controlling the said contact, mcans atthe central station fercontrolling one of the sahlW pcrnble mculbersand mechanism on a line for controlling "another of connecting circuit andflia gree of actuat on'at ono- 't1 me t affect teleactuation at another ti ii e'jto -.rately for controlling ,nie; :sad

'bers separately. I

arranged to be associat rontrol the said contact said operable members, whereby the said signaling deyice is properly controlled 130. The combinationi l'th elephone line extending 'to a central station, (jfiztckghnecting circnit therefor, electricallyoperable device norin'1lly"associ tednitli the 1g: a 'certainjdc phone apparatus, andfan'other degree [of aliect telephone appz'iratiisQ I 131. In a telephonesyste tion with aitelephdne line extending to the central ottice' of, the s ten' jqf a nlelectrically-operabl deuce" at the centralfotlice adapted to beconnec ted with, f connection is made jtlieretvith an v certain'dcgsiee ot act'u tion e i 0 effect telephoneapparatns' and another degree of actuation at anotli timc toagain affect the said telephonea' iratus' l: f f 132. In a telephone"systemjj h ving" extending to a central stationf mechanism at the central station havingla contact exterior of the energizing 'ciii uit thereof for controlling telephone'japparatiis and p' rality of armaturesoperable "separately controlling the said contact, andineans for operating the; said ai matur es separately.

, 133. Inv a: telephone system having, lines extending toa central st'a on, re ;iih

nism at the central staticnrh v ng a'contacit exterior of the energizing circuitlthereotgfor controllingtelephoneapparatiis dafp'liirality of operable members ope 'bl'esep acontacnfand I ll i means 'for operating the said 134-. In a telephone ystem11 extending to a centralized sta "an; a pair of switch members at the I stat bee erating with each other jope n, contact therebe'tweeii, s ijitabl under control ofthefsa id'cont p mechanism at the said/static n;anged;,to be associated with various lines andjharhig a plurality'of armatures opflfilble's'eparately' and acting conjointlyto control. the said contact, the'said armaturcs'being adapted to operate the respective said switch members and each to operate its respective switch member bothwlicn attracted and released.

135," In a telephone system having lines extending to a centralized station, a pair of s\vitcl1 members at 'thesaid station ea e atingwith each 'othertfo open and-close under control of the s nlconta and having a plural operable s'ep'aratclv and act ngconjoii ylto the said 0 V)l0 contact thercbetween, snitable r apparatus members tang a ulna, operate,thelrc l spective saicl switch members and each to operate its respective switch member both when operated by an energizationof the electromagnetic mechanism and' by a (leenergization of same.

136. A signal ClI'Clllh-illld aunitary imag net for exercising control over same, saiol- -magnet having a plurality of armatures adapted to he operated separately, one clos4 ing a contact in said signal circuit and'one opening contact insaicl signal circuit.

having a smallenough current-carrying. ca-

pacity whereby the lamp may be lighted over the line to give a signal throughfvarionsline resistances varying through a. ,rangeipf at least five-hundred ohms, on a oltage suit-' able for such a line.

138. In a telephonerline-signaling system, the combination with a telephone line havmg a resistance of at least five-hundred ohms, of a signal lamp connected lnseries With the line; and means for lighting the lamp over the line to give a signal, the. said:

lamp having a filament with a small enough c-nrrent-carrying capacity whereby it is pre-' vented from burning out upon a d1m1nut1on of the line resistance of at least fiveehunclrecl ohms.

As inventor'of the foregoing, hereunto subscribe m name in the'presence of two subscribing-witnesses, this 19th day of J1i1y,'l904. r

V FEEDER- on PARKER.

I "Witnesses:

'RO .'G.- PARKER, WM F, VIOLETI.

Copies of thhnatent may be. obtained in: in cents each, by adressing the Commissioner of Patent.

' Washington, D: 53. 

